Keep the shirt, it fits sufficiently well elsewhere that even if you wear it under a sweater you did well. I don't care for the tie, but that Lanvin sweater is great (IMHO). Other than that, without an indication of pricing on the other items I don't think you'd have made much on any of them.
Thanks for the reply. If the Lanvin is still there the next time I go there, I'll pick it up and let you know the measurements. I don't remember what it cost, but it had to be <$10.